Online measurement method and device for temperature of polymer melt
A melt temperature and measurement method technology, applied in the direction of measuring devices, thermometers, thermometers with physical/chemical changes, etc., can solve the problems of no quantitative measurement method, high price, limited application, etc., to achieve Effect of in-line quality control, low-cost measurement
Active Publication Date: 2020-07-14
ZHEJIANG UNIV
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Problems solved by technology
Infrared fiber optic temperature sensor is currently the most accurate sensor for in-mold temperature measurement, but its high price has severely limited its application
In addition, some scholars have explored the ultrasonic measurement method of the melt temperature, but they cannot break away from the soft measurement method based on the linear regression of the data, and no effective quantitative measurement method has been given.
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[0071] The forming mold of this embodiment has adopted the form of direct glue feeding, and the schematic diagram of measuring device (experimental mold) is as figure 1 As shown, wherein, 5 and 6 are the rear mold and the front mold of the mould, respectively, and 2 is the glue inlet of the polymer melt, and the melt enters the mold cavity 4 through the glue inlet, and flows, cools, and Cured to become the final product. 1 and 3 in the figure are the melt pressure sensor and the ultrasonic probe respectively, and the ultrasonic probe is a non-contact measurement, so there is a certain distance from the cavity.
[0072] Specifically, the cavity in the experimental mold is a sheet structure with a length of 200mm, a width of 30mm, and a thickness of 2mm. The installation position of the cavity pressure sensor used in the embodiment and the shape of the cavity are as follows figure 2 shown. The ultrasonic probe is in contact with the surface of the mold through a coupling agen...
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Abstract
The invention discloses an online measurement method for temperature of polymer melt. The method comprises the following steps: measuring ultrasonic sound velocity c of ultrasonic waves in the melt inan injection molding process on line, measuring the pressure P of the melt in the injection molding process on line, and acquiring the temperature T of the melt in the injection molding process by using the formula (1). The invention further discloses an online measurement device for the temperature of the polymer melt. By means of the method and the device, the online in-situ characterization for the density of the melt can be realized, and then the online quantitative measurement for the quality of the melt is realized. Compared with an infrared method, the method has the advantages that the cost is obviously reduced, and the method has important significance on theoretical researches including the crystallization process, shear heating and the like.
Description
technical field [0001] The invention belongs to the technical field of ultrasonic testing and material forming, and relates to an online measurement method and device for polymer melt temperature. Background technique [0002] The injection molding process is the most widely used means of producing high-performance polymer products, and is a typical dynamic and complex batch process. Throughout the injection molding process, the polymer undergoes huge pressure and temperature changes from high temperature and high pressure to normal temperature and pressure, which is a complex thermodynamic process. The evolution of the mesoscopic structure and macroscopic physical properties of the melt in this process is related to the thermodynamic properties of the final product. Therefore, understanding and obtaining the evolution process information of the physical properties and mesoscopic structure of the melt during the forming process through the method of online measurement durin...
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IPC IPC(8): B29C45/78G01N29/024G01N29/28G01N29/44G01K13/00G01K11/32
CPCB29C45/78G01N29/024G01N29/28G01N29/4472G01K13/00B29C2945/7604B29C2945/76474G01N2291/011G01N2291/02818G01N2291/02881G01N2291/0252G01N29/228B29C2945/7626G01K11/24G01K13/026
Inventor 赵朋张剑锋纪凯鹏董正阳夏能周宏伟傅建中
Owner ZHEJIANG UNIV